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  • 1
    Online Resource
    Online Resource
    Pyroelectric Coefficient and Heat Capacity of a Ferroelectric Copolymer of Vinylidene Fluoride and Trifluoroethylene at Low Temperatures
    IOP Publishing ; 1992
    In:  Japanese Journal of Applied Physics Vol. 31, No. 8R ( 1992-08-01), p. 2495-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 31, No. 8R ( 1992-08-01), p. 2495-
    Abstract: The temperature dependence of the static pyroelectric coefficient p and dynamic pyroelectric response voltage V s of a highly crystallized ferroelectric copolymer of vinylidene fluoride (75 mol%) and trifluoroethylene (25 mol%) is measured in the temperature range of 10-300 K. The observed p and the heat capacity C p derived from p / V s both decrease with decreasing temperature, tending toward zero in the vicinity of 0 K. The temperature dependence of C p is fitted to the capacity contributed from three- and one-dimensional acoustical modes of vibrations with Debye temperatures of 52 K and 460 K, respectively, and contributed from main optical vibrations. It is found that the one-dimensional acoustical vibrations and optical vibrations with an average frequency of about 290 cm -1 dominantly contribute to the primary pyroelectric coefficient p 1 .
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.31.2495
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1992
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 2
    Online Resource
    Online Resource
    Electrooptical Effects of “Single-Crystalline” Films of Ferroelectric Copolymers of Vinylidene Fluoride and Trifluoroethylene
    IOP Publishing ; 1997
    In:  Japanese Journal of Applied Physics Vol. 36, No. 6A ( 1997-06-01), p. L693-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 36, No. 6A ( 1997-06-01), p. L693-
    Abstract: “Single crystalline” (SC) films of vinylidene fluoride (VDF) and trifluoroethylene (TrFE) copolymers (P(VDF/TrFE)) which are highly double-oriented films, do not form an intricate highly ordered structure, for example, a lamellar structure, but a simple one. After a SC film is poled under a dc electric field, one-to-one correspondence can be observed between the macro-(drawn and poling axes) and optical axes in a SC film of P(VDF/TrFE). Therefore, linear electrooptical effects of SC films of P(VDF/TrFE) can be measured at room temperature and constant stress. We then found a large electrooptical coefficient in SC films of P(VDF/TrFE).
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.36.L693
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1997
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 3
    Online Resource
    Online Resource
    Performance of Multilayered Ultrasonic Transducers Comprising Vinylidene Fluoride and Trifluoroethylene Copolymer Films and Ferroelectric Ceramic Plates
    IOP Publishing ; 1994
    In:  Japanese Journal of Applied Physics Vol. 33, No. 5S ( 1994-05-01), p. 2966-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 33, No. 5S ( 1994-05-01), p. 2966-
    Abstract: Frequency and impulse response characteristics of multilayered ultrasonic transducers comprising forward films of vinylidene fluoride and trifluoroethylene copolymer (P(VDF-TrFE)) and backward ferroelectric ceramic plates of lead-zirconate-titanate (PZT) and a backing load, are studied both theoretically and experimentally. These transducers can be driven in three operation modes: (1) P(VDF-TrFE) as a transmitter and a receiver, (2) PZT as a transmitter and a receiver, and (3) PZT as a transmitter and P(VDF-TrFE) as a receiver. It is found that, owing to the great difference in their acoustic and dielectric properties, PZT plates and P(VDF-TrFE) films operate independently at different frequencies, and that, in operation mode (3), the multilayered transducers exhibit broad frequency bandwidth or shorter impulse response characteristics with high sensitivity and high S / N ratio.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.33.2966
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1994
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 4
    Online Resource
    Online Resource
    Elastic Anisotropy of Single Crystalline P[VDF/TrFE] Copolymer Films with 75/25 Mol Ratio
    IOP Publishing ; 2000
    In:  Japanese Journal of Applied Physics Vol. 39, No. 5S ( 2000-05-01), p. 2922-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 39, No. 5S ( 2000-05-01), p. 2922-
    Abstract: The in-plane elastic anisotropy of hypersonic sound velocities in single crystalline P[VDF/TrFE] copolymer films with 75/25 mol ratio have been studied by Brillouin light scattering in the ferroelectric phase at room temperature. Both as-grown and poled films give an identical anisotropy. To analyze the anisotropy, orientations of the ferroelectric domains with respect to the film coordinate are discussed using a Landau free-energy. We analyzed the in-plane anisotropy applying the individual domain (IDD) model and the effective elastic constant (EEC) model. A complete set of the crystallographic elastic constants was deduced for the IDD model. The EEC model gives four EECs, C 11 E , C 33 E , C 44 E and C 13 E . Both models can successfully reproduce the observed anisotropy.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.39.2922
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2000
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 5
    Online Resource
    Online Resource
    Temperature Dependence of Shear Piezoelectric Properties of Poly(vinylidene fluoride) Studied by Piezoelectric Resonance Method
    IOP Publishing ; 1996
    In:  Japanese Journal of Applied Physics Vol. 35, No. 3R ( 1996-03-01), p. 1818-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 35, No. 3R ( 1996-03-01), p. 1818-
    Abstract: Elastic and dielectric anisotropies, and shear piezoelectric properties of uniaxially oriented poly(vinylidene fluoride) (PVDF) were determined in the temperature range from 10 K to 400 K by a piezoelectric resonance method. The shear piezoelectric stress constant e 24 increases above the primary dispersion temperature, while e 15 decreases markedly and tends to zero at 390 K: e 24 and e 15 are, respectively, 28 mC/m 2 and 38 mC/m 2 at 10 K, and 48 mC/m 2 and 15 mC/m 2 at 295 K (where the coordinate axes X and Z in the film refer to the stretching axis and poling axis, respectively). The temperature dependences of e 24 and e 15 are analyzed on the basis of the model in which the crystalline and amorphous phases are combined in series and parallel along the chain axis. The analysis shows that e 15 in the crystalline phase decreases considerably above the primary dispersion temperature, whereas e 24 in the crystalline phase increases with increasing temperature.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.35.1818
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1996
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 6
    Online Resource
    Online Resource
    Thin Films of (BEDT-TTF) 2 Cu(NCS) 2 Prepared by an Electrodeposition Method *
    IOP Publishing ; 1992
    In:  Japanese Journal of Applied Physics Vol. 31, No. 6R ( 1992-06-01), p. 1899-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 31, No. 6R ( 1992-06-01), p. 1899-
    Abstract: Thin films of (BEDT-TTF) 2 Cu(NCS) 2 are prepared by the electrochemical oxidation of BEDT-TTF at a large current density. The films are composed of numerous platelets, which are set on edge and loosely packed on the anodes. The X-ray diffraction suggests that the product contains both amorphous regions and κ-type and other crystals. The ESR and conductivity are discussed in terms of the presence of amorphous regions.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.31.1899
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1992
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 7
    Online Resource
    Online Resource
    Polarization Behavior in Vinylidene Fluoride-Trifluoroethylene Copolymer Thin Films
    IOP Publishing ; 1986
    In:  Japanese Journal of Applied Physics Vol. 25, No. 3R ( 1986-03-01), p. 383-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 25, No. 3R ( 1986-03-01), p. 383-
    Abstract: The polarization behavior in films of vinylidene fluoride trifluoroethylene copolymer (P(VDF-TrFE), VDF/TrFE molar content ratio of 75/25) of thickness less than 1 µm is reported. Ferroelectricity is maintained even in 0.06 µm-thick film, whose saturated polarization is as large as that for thick films (100 mC/m 2 ). However, the crystallites are much smaller than in thick film, and the coercive field in the thin film is higher (125 MV/m) for the 0.06 µm-thick film) than that of the thick one (40 MV/m). The switching time does not follow the exponential law, but is inversely proportional to the applied field. To analyze these data, we introduce a model in which the thin film contains many defects in its crystalline phase, and the local field in the film is modulated by the defects. The observed switching behavior is consistent with the model.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.25.383
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1986
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 8
    Online Resource
    Online Resource
    Pressure Effect on Energy Transfer in Anthracene-Tetracene Mixed Crystal
    Physical Society of Japan ; 1964
    In:  Journal of the Physical Society of Japan Vol. 19, No. 10 ( 1964-10), p. 1996-1997
    Details
    In: Journal of the Physical Society of Japan, Physical Society of Japan, Vol. 19, No. 10 ( 1964-10), p. 1996-1997
    Type of Medium: Online Resource
    ISSN: 0031-9015 , 1347-4073
    URL: Article
    DOI: 10.1143/JPSJ.19.1996
    RVK:
    UA 4710
    Language: English
    Publisher: Physical Society of Japan
    Publication Date: 1964
    detail.hit.zdb_id: 2042147-3
    SSG: 25
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  • 9
    Online Resource
    Online Resource
    Analysis of Impulse Response Characteristics of Polymer Ultrasonic Transducers
    IOP Publishing ; 1988
    In:  Japanese Journal of Applied Physics Vol. 27, No. 4R ( 1988-04-01), p. 540-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 27, No. 4R ( 1988-04-01), p. 540-
    Abstract: The impulse response characteristics of polymer ultrasonic transducers were analyzed using the Mason's equivalent circuit. These characteristics strongly depend on material factors of the piezoelectric polymer: the dielectric and mechanical internal loss factors, the electromechanical coupling factor and the acoustic impedance. Based on the analytical results, we evaluated the piezoelectric polymers that are presently available as transducing materials. The analytical results were verified experimentally using transducers composed of poly(vinylidene-fluoride) film and vinylidene fluoride and trifluoroethylene copolymer film.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.27.540
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1988
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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  • 10
    Online Resource
    Online Resource
    Growth of Single Crystals of Poly(vinylidene fluoride) under High Pressures
    IOP Publishing ; 1989
    In:  Japanese Journal of Applied Physics Vol. 28, No. 9A ( 1989-09-01), p. L1612-
    Details
    In: Japanese Journal of Applied Physics, IOP Publishing, Vol. 28, No. 9A ( 1989-09-01), p. L1612-
    Abstract: Lamellar crystals of poly(vinylidene fluoride) about 0.2 µm thick and 10 µm wide are grown in films crystallized at high pressures and high temperatures. Electron diffraction shows that the lamellar crystal is a β-form single crystal composed of all-trans extended chains. DSC and crystallization studies suggest that the β-form crystals are grown in the paraelectric or hexagonal phase which appears above 2.0 kb and 260°C in the heating process and above 2.0 kb and 210°C in the solidification process. The phase diagram of PVDF is proposed. The β-form film has distinctive ferroelectricity and strong piezoelectricity: P r =100 mC/m 2 and E c =75 MV/m, and k t =0.2.
    Type of Medium: Online Resource
    ISSN: 0021-4922 , 1347-4065
    URL: Article
    DOI: 10.1143/JJAP.28.L1612
    RVK:
    UA 4210.1
    RVK:
    UA 4210.2
    RVK:
    UA 4210
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 1989
    detail.hit.zdb_id: 218223-3
    detail.hit.zdb_id: 797294-5
    detail.hit.zdb_id: 2006801-3
    detail.hit.zdb_id: 797295-7
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